K-756 是一种直接的tankyRase(TNKS) 选择性抑制剂，对TNKS1和TNKS2的 ADP-核糖基化活性有抑制作用，IC50分别为 31 和 36 nM。

K-756 is a direct and selective inhibitor of tankyrase (TNKS), which inhibits the ADP-ribosylation activity of TNKS1 (IC50 = 31 nM) and TNKS2 (IC50 = 36 nM).

K-756 inhibits the cell growth of APC-mutant colorectal cancer COLO 320DM and SW403 cells by inhibiting the Wnt/β-catenin pathway. K-756 is a novel and selective Wnt/β-catenin pathway inhibitor targeting tankyrase (TNKS). TNKS is one of the members of the PARP family. K-756 binds to the induced pocket of TNKS and inhibits its enzyme activity. K-756 inhibits TNKS1 and TNKS2 by 97% and 100%, respectively. The inhibitory activity of K-756 against PARP1, PARP2, PARP3, PARP6, PARP7, and PARP11 is less than 13%. K-756 strongly inhibits the reporter activity in DLD-1/TCF-Luc cells (IC50: 110 nM) but does not inhibit DLD-1/mtTCF-Luc cells, even at 1,000 nM. APC-mutant colorectal cancer cell line COLO 320DM and SW403 cells are treated with K-756 and after 144 hours, cell growth inhibition is measured by an XTT assay. The application of K-756 inhibits the cell growth of COLO 320DM with a GI50 of 780 nM. K-756 also inhibits SW403 with a GI50 of 270 nM[1].

Vehicle (0.5% MC400) or K-756 is administered orally once a day for 3 days at 100, 200, and 400 mg/kg. The Wnt/β-catenin signal inhibition in the tumor is detected by measuring FGF20 and LGR5 and luciferase activity. The Wnt/β-catenin signal inhibition at a dose of 400 mg/kg is observed from 1-day administration. The expression of FGF20 and reporter activity are significantly decreased at doses of 100 mg/kg and above at 3-day administration. The expression of LGR5 is significantly decreased at doses of 200 mg/kg and above at 3-day administration. The maximum inhibitory activity is reached with the administration of K-756 at a dose of 400 mg/kg at 3-day administration [1].

130017-40-2

C24H27N5O3

433.5

DMSO:4.5 mg/mL (10.38 mM),Need ultrasonic
Powder: -20°C for 3 years
In solvent: -80°C for 2 years